Mr Kaser said he could not free his leg, he was alone and he didn't have his mobile phone.

"I stepped right in the damn thing. It grabbed a hold of me. I can remember seeing it start and I go, 'This ain't good,'" he said.

"And then when my foot was in there banging around, I was trying to hold my leg, pulling it out, and I said, 'This is not good.'

"I don't know if I had [my mobile phone] with me, if it fell in the auger and went in the bin. I don't know. But nobody has been able to find it."

The auger — which looks like a giant drill bit and ferries grain from the ground to a bin — kept pulling on his leg, tearing away skin, tissue and muscle until he could see bone protruding through the lower portion of his leg.